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A penny dropped from the top of the Empire State Building will reach its terminal velocity of around 30-50 MPH as it descends, and as it weighs just a single gram, it will definitely not have enough power to do any damage. Yeah, it might sting a bit, or even leave a bit of a welt, but I doubt it would do anything more permanent than a nasty bruise and an awesome story. A roll of pennies, on the other hand, would have a much higher terminal velocity, and with a significantly greater mass would probably do some real damage.